Ophiomyia kwansonis Sasakawa, 1961

Lonsdale, Owen, 2021, Manual of North American Agromyzidae (Diptera, Schizophora), with revision of the fauna of the " Delmarva " states, ZooKeys 1051, pp. 1-481 : 1

Ophiomyia kwansonis Sasakawa

Figs 356-359

Ophiomyia kwansonis Sasakawa, 1961: 355. Shiao and Wu 1999: 344; Matsumoto and Sasakawa 2006: 20; Williams and Steck 2011: 7, 2014: 421; Shi, Chunyan and Gao 2015: 61.

Description.

Wing length 2.0-2.5 mm (♂♀). Length of ultimate section of vein M4 divided by penultimate section: 0.8-1.0. Eye height divided by gena height: 4.0-6.0. Facial carina distinct; bulb narrow, slightly wider than carina, with medial longitudinal furrow and dorsal 1/2 shiny. Clypeus strongly narrowed anteriorly. Anterior portion of buccal cavity narrowed, not much wider than clypeus. Gena slightly produced anteriorly, forming an ~ 80° angle. Notum subshiny. Ocellar triangle with sides convex, nearly meeting past midpoint and attaining anterior margin of frons. Fronto-orbital plate narrow and shiny, slightly widening around base of fronto-orbitals.

Chaetotaxy: Male vibrissal fasciculus thick, slightly upcurved and not longer than gena. Two ori; two ors. Mid tibia with small posteromedial seta past midpoint.

Colouration: Body, including halter dark brown to black, with nearly indistinct metallic sheen on abdomen, and with fronto-orbital plate and ocellar triangle paler. Wing veins brown. Calypter margin and hairs grey.

Genitalia: (Figs 356-359 ) Surstylus narrow with several scattered rows of tubercle-like setae at apex and inner-distal surface. Metepiphallus with single pair of posteromedial spines. Basiphallus sclerotised basally on dorsobasal and left lateral surfaces, and with long right-lateral process that is widened at apex and attaining level of base of distiphallus. Distiphallus with blunt subconical base that extends posteriorly past narrow mesophallus and is internally spinulose on ventral and left ventrolateral surfaces; widest near midpoint, distally with spinulose right lateral chamber and thin distomedial chamber with sclerotised ventral surface and irregular internal folds. Ejaculatory apodeme relatively narrow with distal margin of blade reduced, pale and irregular.

Host.

Asphodelaceae - Hemerocallis fulva .

Distribution.

USA: AL, AR, CA, CT, DE, FL, GA, IL, IN, KA, KY, LA, MA, MD, MI, MO, MS, NC, NH, NY, OH, OK, PA, SC, TN, TX, VA, WI, WV. Japan, Taiwan. Slovenia.

Type material.

Holotype: Japan. Honshu: Kyoto, Shimogamo, on Hemerocallis fulva kwanso , 21.v.1956, Sasakawa (1♂, Osaka Museum of Natural History). [Not examined]

Additional material examined.

USA. MD: Anne Arundel Co., Davidsonville , 7.vii.2011, on Hemerocallis sp., G.L. Williams (1♂ 11♀ [in alcohol], CNC; 1♂ 1♀, CSCA) .

Comments.

Originally described from Japan as a leaf miner in the ornamental daylily Hemerocallis fulva kwanso , this fly is a recent invasive in North America ( Williams and Steck 2011, 2014), and will soon likely occur in most regions where daylily is grown. Life history and immature stages are discussed in Sasakawa (1961) and Williams and Steck (2011). The only other agromyzid known to occur on Hemerocallis is Liriomyza hemerocallis Iwasaki, also from Japan, but this species feeds on seeds, not within leaves ( Iwasaki 1993).

Figures

Figures 356 - 359. Ophiomyia kwansonis Sasakawa, male genitalia 356 external genitalia, ventral 357 hypandrium, ventral 358 hypandrial complex, left lateral 359 phallus and epiphallus, ventral.